Senior Full-stack Developer (React / Node.js)

🏢 Summary: Fullstack Engineer role focused on building and scaling SaaS products, internal tools, AI-driven workflows, and third-party integrations. The position combines React/Next.js frontend work with Node.js/NestJS backend development, async processing, and production LLM automation. 🗂️ Requirements: 2.5+ years of professional full-stack experience, React.js, Next.js, Node.js, External API integrations, AI development tools, SQL, PostgreSQL, Async processing, Queues, Background jobs, Reliable-system design, English fluency, Polish fluency 📃 Skills: React.js, Next.js, Node.js, NestJS, OpenAI, Claude, Cursor, SQL, PostgreSQL, REST, WebSockets, LavinMQ, BullMQ, Kafka, GitLab, AWS, Fly.io, Golang, Elixir, Rust, BigQuery, ClickHouse, gRPC 🏢 Description: At Web Impact, we’re more than just an email marketing agency and digital solutions provider. We build cutting-edge, socially impactful products that redefine how businesses operate in the digital world. We’re looking for a Fullstack Engineer who enjoys building complex systems, integrating external services, and leveraging AI tools to speed up development and automate workflows. If you’re excited about combining modern frontend development with AI-driven workflows and automation tools like Claude Code, Cursor, and LLM frameworks , this one is for you. What You’ll Do Develop and contribute to end-to-end features across SaaS products and internal tools, collaborating with senior engineers on architecture and implementation decisions. Build modern, high-performance frontends using Next.js and React.js Develop scalable backend services using Node.js / NestJS Design and integrate APIs (REST, WebSockets, external services) Build and maintain automation workflows and background jobs Work with async systems, queues, and event-driven architectures Integrate third-party services with real-world constraints (rate limits, retries, auth flows) Use AI tools to improve development speed, testing, and automation Collaborate directly with product, data, and leadership teams Build MVPs, proof-of-concepts, and new product ideas from scratch Rapidly validate business ideas through experimentation and iteration Help evolve successful prototypes into production-ready systems AI & Automation This role includes working with modern AI tooling and automation systems, with a strong focus on speed, ownership, and execution : Using tools like Claude Code, Cursor, and OpenAI SDK in daily development Building AI-driven workflows and integrations quickly and iteratively Automating repetitive processes (data handling, content, integrations) Applying LLMs in production with a pragmatic, results-first approach Taking ownership of problems - from idea to production Shipping fast, testing in real conditions, and iterating based on outcomes Being accountable for delivery - not just writing code, but making things work end-to-end Prioritizing execution over perfection - speed is key What We’re Looking For 2,5+ years of professional full-stack experience Strong frontend skills in React.js / Next.js Backend experience with Node.js (NestJS preferred) Experience integrating external APIs (auth, pagination, retries, rate limits) Hands-on experience with modern AI tools (OpenAI, Claude, Cursor, etc.) Good SQL skills (PostgreSQL preferred) Experience working with async processing, queues, and background jobs Understanding of building reliable systems (error handling, retries, observability) Strong communication skills and ability to work cross-functionally Fluent in English and Polish Nice to Have Experience with Rust (async, Tokio, Axum) Experience with Elixir (Phoenix LiveView, GenServer) Understanding of distributed systems and architectures Experience with multi-region deployments and geo-distributed infrastructure Experience building systems with high parallelism (a large number of workers processing jobs concurrently) Familiarity with distributed databases and data consistency trade-offs Experience with multi-tenancy architectures (tenant isolation, scaling strategies) Experience working with high-throughput event pipelines Our Tech Stack Frontend: Next.js, React.js Backend: Node.js, NestJS, Golang, Elixir, Rust Data: PostgreSQL, BigQuery, ClickHouse Infra: AWS, Fly.io , Google Cloud, DigitalOcean Queues & Workers: LavinMQ, BullMQ, Kafka CI/CD: GitLab CI AI/ML & Automation: Proprietary GenAI models, OpenAI, Claude, internal tooling Integrations: REST, gRPC, WebSockets, external APIs with rate limits Why Join Us? Work on high-scale SaaS systems processing hundreds of millions of events daily , with real-time pipelines and data-heavy workloads. Ownership from day one - influence architecture, technology choices, and product direction. Collaborate with world-class engineers, AI specialists, and PMs. Innovation-first culture - explore cutting-edge frameworks and architectures. Fast execution, minimal bureaucracy, no unnecessary meetings Opportunity to work with modern AI tooling in production Competitive senior-level compensation and career growth. Social impact - contribute to automation products that empower businesses and communities. Our Streamlined Hiring Process Initial call Technical deep dive with our team Decision

🏢 Summary: Senior Fullstack Developer role for a greenfield project management module, building React front ends with C#/.NET microservices. The position covers end-to-end delivery, automated testing, Azure DevOps CI/CD, and deployments to Kubernetes in Azure, with 100% remote work available. 🗂️ Requirements: React experience, C# and .NET development experience, Microservices architecture knowledge, Docker and Kubernetes experience in Azure, Azure DevOps workflow experience, CI/CD execution experience, Automated unit and integration testing practice, Ability to independently own complex development tasks, Fluent English, Residence in Poland or eligibility to work in Poland 📃 Skills: React, C#, .NET, Microservices, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, GitHubCopilot, Testing 🏢 Description: Your responsibilities - Design, develop, and maintain fullstack features with a focus on front-end web application development using React coupled with C# and .NET microservices. - Build automated intelligent forms, dynamic UI workflows, and CMS-connected data pipelines for a greenfield project management module. - Take ownership of the end-to-end development cycle, including writing automated unit and integration tests, deployment, and monitoring. - Collaborate with the team utilizing AI-assisted coding tools like GitHub Copilot to maintain code quality and accelerate delivery. - Interact directly with Azure DevOps CI/CD pipelines and push code into a cloud-hosted Kubernetes cluster in Azure. Requirements - Experience in React, with the ability to take ownership of complex frontend tasks. - Knowledge of Tailwind CSS or UI libraries like shadcn/ui is an advantage. - Experience in C# and .NET development, including practical knowledge of microservices architecture. - Experience with modern cloud deployment environments, specifically Docker and Kubernetes in Azure. - Experience working with Azure DevOps workflows, including pull requests, code reviews, and basic CI/CD execution. - Habit of writing automated tests for your own code. - Independent, self-starter mindset with the ability to drive tasks independently and navigate established architectures. - Fluent English language skills. - You need to live in Poland and/or be eligible to work here. What we offer - 100% remote work. - Work in a Scandinavian culture built on logic and dialogue. - Health and sports benefits tailored to your needs. - Speed Coaching – short sessions that provide new perspectives and solutions. - Sports training, an internal team, and opportunities to take part in competitions. - Team events and development-focused meetups.

🏢 Summary: Long-term, fully remote Senior Fullstack Engineer role building a cloud-native IoT platform for building automation and energy management. The work spans React.js applications, JVM microservices, REST APIs, cloud architecture, automated quality practices, and AI-assisted development. 🗂️ Requirements: 5+ years of commercial full-stack experience, Strong product mindset and ownership of delivered features, Java or Kotlin expertise, Spring Boot and JVM ecosystem knowledge, Microservices architecture and REST API design experience, React.js and modern JavaScript/TypeScript experience, Cloud-native architecture knowledge, Docker containerization experience, Practical Kubernetes knowledge, Daily use of AI-assisted development tools with critical code review skills, Fluent English at C1 level 📃 Skills: Java, Kotlin, Spring, React, JavaScript, TypeScript, Docker, Kubernetes, Copilot, ChatGPT 🏢 Description: About the Project We are seeking an experienced Senior Fullstack Engineer on behalf of our client—a European leader in building automation, energy management, and BMS/EMS/IoT solutions. The project focuses on building and evolving a modern, scalable, next-generation cloud-native platform (Cloud-native / IoT), bringing together a high-performance microservices backend and modern user-facing applications. Work Mode: 100% Remote Start Date: ASAP Duration: long-term Job responsibilities: Building and scaling complete solutions from React.js frontends to robust JVM-based microservices on the backend. Participating in technical discussions, designing REST APIs, and contributing to overall platform modernisations and cloud architecture. Collaborating directly with Product Owners to understand business goals, challenge assumptions constructively, and suggest improvements. Writing clean code, implementing automated testing, conducting code reviews, and maintaining comprehensive technical documentation. Regularly leveraging AI tools (e.g., GitHub Copilot) in daily workflows to boost development speed, generate documentation, and improve productivity. Expectations: 5+ years of commercial Full-stack experience with a strong Product Mindset and proven ownership of delivered features. Strong knowledge of Java and/or Kotlin (JVM ecosystem, Spring Boot), microservices architecture, and REST API design. Hands-on experience with React.js and the modern JavaScript/TypeScript ecosystem. Solid understanding of Cloud-native architectures, containerization (Docker), and practical knowledge of Kubernetes (K8s). Daily active use of AI-assisted tools (Copilot, ChatGPT, etc.) paired with critical code review skills. Fluent English (C1 level) for seamless collaboration in an international environment. (Nice to Have): Experience with SaaS platforms or event-driven architecture, prior domain exposure to IoT, BMS, HVAC, SCADA, or industrial automation, and working knowledge of German. We offer Ongoing support from a dedicated agent , taking care of your project continuity, client contact, necessary formalities, work comfort and development Consultant Development Program – advice on growth planning based on the latest trends and market needs in IT, including consultations with agents and growth mentors Access to 7N Learning & Development – a development and educational platform with webinars, a library of articles and industry reports, and regular invitations to one-time and recurring development events – technical, business, and lifestyle Spectacular integration events , both for you (e.g., annual Kick-Off trip , Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g., family picnics, movie premieres) Professional development not only during the project – you can get involved in knowledge transfer to others within the 7N Services offering directed at 7N clients Relationships and access to the knowledge of the most experienced IT experts in the market – the average professional tenure of our consultants in Poland is over 10 years A complete benefits package , including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad About 7N Constantly searching for projects, difficult rate negotiations, lack of development support – sounds familiar? At 7N, you gain not only stability of contracts but also the personal involvement of a dedicated agent who ensures your professional comfort and continuous access to development initiatives. Our mission is to provide stable and rewarding collaborations that drive your success as an IT expert and the success of our clients. We build long-lasting relationships based on Scandinavian values and 30 years of experience creating IT solutions for over 200 organizations.

🏢 Summary: Senior Fullstack Developer role for building a greenfield project-management module, with React front-end development and C#/.NET microservices. The position covers end-to-end delivery, including automated testing, CI/CD deployment, and monitoring in Azure Kubernetes environments. It offers 100% remote work for candidates based in or eligible to work in Poland. 🗂️ Requirements: React experience, C# and .NET development experience, Practical microservices architecture knowledge, Docker and Kubernetes deployment experience in Azure, Azure DevOps workflow experience, Automated unit and integration testing practice, Ability to independently own and deliver complex tasks, Fluent English, Residence in Poland or eligibility to work in Poland 📃 Skills: React, C#, .NET, Microservices, Docker, Kubernetes, Azure, AzureDevOps, CI/CD, GitHub, Copilot, Testing 🏢 Description: e are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we work with full autonomy. We independently choose our technologies, processes, and ways of working while maintaining the highest professional standards. We deliver a wide range of IT projects in Poland and internationally, across multiple domains and technologies. This allows our consultants to develop their competencies and gain experience aligned with their professional ambitions. Our collaboration is built around the CARE philosophy. For us, it means responsible project matching, transparent cooperation, and a long-term approach to professional growth. Join us as Senior Fullstack Developer. Grow in an environment that cares about your development as much as you do. Your responsibilities Design, develop, and maintain fullstack features with a focus on front-end web application development using React coupled with C# and .NET microservices. Build automated intelligent forms, dynamic UI workflows, and CMS -connected data pipelines for a greenfield project management module. Take ownership of the end-to-end development cycle, including writing automated unit and integration tests, deployment, and monitoring. Collaborate with the team utilizing AI-assisted coding tools like GitHub Copilot to maintain code quality and accelerate delivery. Interact directly with Azure DevOps CI/CD pipelines and push code into a cloud-hosted Kubernetes cluster in Azure . Requirements Experience in React , with the ability to take ownership of complex frontend tasks. Knowledge in Tailwind CSS or UI libraries like shadcn/ui is an advantage. Experience in C# and .NET development, including practical knowledge in microservices architecture. Experience with modern cloud deployment environments, specifically Docker and Kubernetes in Azure . Experience working with Azure DevOps workflows, including pull requests, code reviews, and basic CI/CD execution. Habit of writing automated tests for your own code. Independent, self-starter mindset with the ability to drive tasks independently and navigate established architectures. Fluent English language skills. You need to live in Poland and/or be eligible to work here. What we offer • 100% remote work • Work in a Scandinavian culture built on logic and dialogue. • Health and sports benefits tailored to your needs. • Speed Coaching – short sessions that provide new perspectives and solutions. • Sports training, an internal team, and opportunities to take part in competitions. • Team events and development-focused meetups.

🏢 Summary: Senior Full-Stack Engineer role focused on building scalable ASP.NET/C# microservices and React/TypeScript interfaces, with a 60/40 frontend-to-backend split. The position offers technical ownership, mentoring opportunities, and a potential path to Tech Lead while working hybrid from Poland under an employment contract. 🗂️ Requirements: Poland residency, MSc in Computer Science or equivalent, 5+ years building secure REST APIs with ASP.NET, 5+ years developing frontend applications with React, Microservices architecture expertise, Cloud design-pattern knowledge, Technical ownership, Technical leadership, English B2 fluency 📃 Skills: ASP.NET, C#, React, TypeScript, REST, Microservices, Cloud, AWS, Agile, DDD 🏢 Description: We’re looking for a Senior Full-Stack Engineer who brings deep technical expertise and a collaborative mindset to our product development team. You will work with a modern microservices architecture, building scalable backend services using the ASP.NET Web API with C#, and intuitive frontend interfaces using mainly React and TypeScript. This is a hands-on engineering role with a 60/40 front-/backend focus, ideal for someone who likes to take ownership, thrives in a dynamic product team, and enjoys mentoring others. This role could easily become a Tech Lead role in a foreseeable future. If you're passionate about designing high-impact software in a cloud-native environment, we’d love to hear from you. This Poland-based role offers remote flexibility, but we value in-person collaboration. Our team meets in Poland for at least one week each quarter, so we request all applicants to be located in Poland. This is not a globally remote role. Poland residency is required. The contract form is Umowa o Pracę (only, no B2B). What you will be responsible for Collaborate proactively in refinement sessions with product and tech teams to ensure clarity and feasibility of features. Design, implement, and maintain scalable web APIs using ASP.NET and microservices architecture principles. Develop responsive user interfaces with React and TypeScript that enhance usability and performance. Work closely with Product Owners to clarify feature requirements and ensure business context is well-understood. Define, design and align feature architecture with the Head of Engineering to ensure consistency and scalability. Ensure features meet Definition of Done, with state-of-the-art unit, integration, and end-to-end test coverage. Support incident response and production issue resolution as per team standards. Actively contribute to team knowledge sharing and coach colleagues in technical best practices. What makes you a match Essential Qualifications: MSc+ in Computer Science or equivalent 5 years of proven experience in building secure REST APIs using ASP.NET , as well as developing solid front-end applications with React are non-negotiable must haves. Comprehensive knowledge of contemporary web application architectures, with a focus on microservices and cloud design patterns. Demonstrated ability of high technical Ownership and Tech Leadership are a requirement for this role. Bonus Skills: Hands-on experience with AWS infrastructure. Experience working in cross-functional product teams using Agile practices and following Domain-Driven Design (DDD). Collaboration and Interpersonal Skills: Clear and adaptive communication with both technical and non-technical stakeholders. Strong sense of ownership, accountability, and proactive problem-solving. Languages: English: B2 - (No certificate required, but Fluency) Polish and German: desired, not required What you can expect A dynamic, ambitious team where your voice is heard, and your contributions truly matter. You’ll have real ownership over your decisions in a trusted, cross-functional environment within a Swiss product company that puts people first. We offer fair compensation, flexible working hours, a hybrid work setup, and a culture that supports both personal and professional growth, fostering a healthy work-life balance. Employer of Record: For this role, we offer employment through our trusted Employer of Record provider Remote.com , ensuring full legal compliance and a seamless experience for our team members in Poland. ID Verification: To maintain a fair and secure hiring process, candidates may be asked to verify their identity their identity before speaking with our Recruiter. This step helps us prevent fraud and focus our resources on genuine applicants. About us Who we are esurance is a Swiss InsurTech offering a SaaS platform that connects SMEs, insurance providers, brokers, and business application providers. Founded in 2013, we're on a mission to make health insurance for small businesses truly hassle-free. What makes us unique You'll be part of a connected, forward-thinking team built on trust, openness, and mutual respect — working hybrid from Zürich or remotely across Europe. We invest in your growth through agile practices, real ownership, and a transparent Grading System that ensures fair pay and clear career paths. Our core values We are connected. We are ahead. We are clear. We are approachable. Do these resonate with you? → Come join us. Our Recruitment Process & Principles We keep our process transparent and respect your time: Application Review — You hear from us within 5 business days. Always. Recruiter Screen — A relaxed Get2Know call to explore mutual fit. Four Interviews — Two Role Knowledge interviews (peer + supervisor), one Culture Match, one Leadership conversation. Batched into two days wherever possible. Hiring Decision — Thoughtful, timely. You'll know within 1–2 weeks. Use of Artificial Intelligence (AI) We use AI to increase productivity and you're welcome to use it to polish your CV or Coverletter. Interviews and assessments should reflect your genuine self, though. Recruiting Agencies: We don't work with unsolicited agency submissions. Thanks for respecting this.

🏢 Summary: Senior Fullstack Engineer role focused on building scalable cloud-native applications with a 50/50 split between React/TypeScript frontend development and Node.js microservices backend development. The position includes API and UI development, automated testing, production support, and technical mentoring in a product-driven team. It is a Poland-based hybrid/remote role requiring quarterly in-person collaboration in Poland. 🗂️ Requirements: Poland residency, MSc in Computer Science or similar, 7–10 years of JavaScript/TypeScript experience, React and modern SSR framework expertise, Node.js expertise, Strong automated testing skills, Fluent English 📃 Skills: JavaScript, TypeScript, React, Node.js, Vitest, Playwright, Storybook, AWS, Lambda, S3, CloudFront, IAM, Pulumi, Microservices, SSR, Remix, Next.js 🏢 Description: We’re seeking a Senior Fullstack Engineer with a passion for building scalable, cloud-native applications using modern JavaScript technologies. In this hands-on role, you’ll collaborate with the product development team to design and implement microservices and micro frontend architectures, ensuring high performance, usability, and maintainability. This role offers a 50/50 split between frontend and backend development and is suited to someone who thrives in a fast-paced, product-driven environment, takes ownership, and enjoys mentoring teammates. Experience with React, TypeScript, and Node.js is essential to creating impactful solutions. This Poland-based role offers remote flexibility, with in-person collaboration in Poland for at least one week each quarter. Applicants must be located in Poland; this is not a globally remote role. The contract form is Umowa o Pracę (brutto). Quick Facts • 50/50 frontend and backend development split • Remote flexibility within Poland, with quarterly in-person team meetings in Poland • Umowa o Pracę (brutto) contract What you will be responsible for • Collaborate in refinement sessions with product and tech teams to ensure feature clarity and feasibility. • Design, implement, and maintain scalable web APIs using Node.js and microservices architecture principles. • Develop responsive, high-quality user interfaces with React and TypeScript. • Work closely with Product Owners to clarify feature requirements and ensure business context is well understood. • Align feature architecture with Tech Leads to ensure consistency and scalability. • Ensure features meet the Definition of Done with robust unit, integration, and E2E test coverage. • Support incident response and production issue resolution. • Mentor teammates and contribute to knowledge sharing in technical best practices. Essential Qualifications • MSc in Computer Science or similar • 7–10 years of professional experience in JavaScript/TypeScript • Expertise in React with a modern SSR framework: React Router v7, Remix, or Next.js • Node.js backend expertise • Strong testing skills with Vitest, Playwright, and Storybook interaction/component-driven tests Bonus Skills • Familiarity with AWS, including Lambda, S3, CloudFront, IAM, and Pulumi/infrastructure as code • Agile and DDD experience in cross-functional teams Collaboration and Interpersonal Skills • Clear communication with technical and non-technical stakeholders • Ownership mindset and proactive problem-solving • Fluent English required; German, Polish, and Ukrainian are nice to have What you can expect • A dynamic, ambitious team where your voice is heard and contributions matter • Ownership over decisions in a trusted, cross-functional environment • Fair compensation, flexible working hours, and a hybrid work setup • Support for personal and professional growth and a healthy work-life balance Employer of Record Employment is offered through an Employer of Record to ensure legal compliance and a seamless experience for team members in Poland. ID Verification Candidates may be asked to verify their identity via PEScheck before speaking with recruiters to support a fair and secure hiring process.

🏢 Summary: Remote 12-month contract for a Full Stack Developer to build scalable .NET/React applications and deliver production AI-powered features. The role requires practical commercial AI implementation experience, including LLM integrations, RAG, agents, vector search, or intelligent automation. 🗂️ Requirements: 5+ years of commercial C#/.NET experience, Hands-on React and TypeScript experience, Experience building REST APIs, backend services, or microservices, Experience with Azure or another major cloud platform, Git and CI/CD experience, Practical production AI development experience, Experience integrating AI functionality into a commercial application or product, Polish and English communication skills 📃 Skills: C#, .NET, React, TypeScript, REST, Azure, Git, CI/CD, LLMs, RAG, AzureOpenAI, OpenAI, Embeddings, Microservices 🏢 Description: We are looking for an experienced Full Stack Developer (.NET / React) with real, hands-on experience building AI-powered solutions or features. We are specifically looking for developers who have gone beyond simply using GitHub Copilot or other AI coding assistants. You should have designed, developed, integrated, or deployed AI functionality within a commercial application or product. Location: Remote – Poland Language: Polish and English Start: September 2026 Contract: 12 months Interview process: 1 interview only Key Responsibilities • Design and develop full-stack applications using C# / .NET and React. • Build scalable backend services, REST APIs, and integrations. • Design and implement AI-powered features as part of real applications or products. • Integrate applications with LLMs and AI services such as Azure OpenAI, OpenAI, or similar platforms. • Work with technologies and concepts such as RAG, AI Agents, prompt orchestration, vector search, embeddings, or intelligent automation, depending on the use case. • Take AI solutions from idea/prototype through integration and production implementation. • Work closely with architects, product owners, and engineering teams. Required Skills • 5+ years of commercial C# / .NET experience. • Strong hands-on experience with React and TypeScript. • Experience developing REST APIs, backend services, and/or microservices. • Azure or another major cloud platform. • Git, CI/CD, and modern software engineering practices. • Strong Polish and English communication skills. AI Experience – Important We need someone with practical AI development experience, not only exposure to AI tools. You should have built or contributed to at least one solution involving areas such as: • LLM integration within a commercial application. • RAG (Retrieval-Augmented Generation) solutions. • AI Agents / agentic workflows. • Integration with Azure OpenAI, OpenAI APIs, or similar AI platforms. • Vector databases, embeddings, or semantic search. • AI-powered document processing, classification, extraction, or summarisation. • Intelligent workflow/process automation using AI. • Custom AI assistants or conversational applications. • Other production AI/ML functionality integrated into software products. We are interested in developers who can clearly explain what AI solution they built, what problem it solved, which technologies they used, and what their personal contribution was.